Update colors, switch to native method

app/src/main/java/be/ugent/sel/studeez/common/ColorPalette.kt

@@ -1,6 +1,8 @@
 package be.ugent.sel.studeez.common
 
 import androidx.compose.material.Colors
+import androidx.compose.material.MaterialTheme
+import androidx.compose.runtime.Composable
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.toArgb
 import androidx.core.graphics.ColorUtils
@@ -10,6 +12,7 @@ import androidx.core.graphics.ColorUtils
 // Use colours by calling (for example)
 // ColorPalette.HIGH_EMPHASIS.onPrimary
 
+// TODO Delete this class as we are now using ui.theme.Theme
 class ColorPalette {
     companion object {
         // Use High emphasis colours if the thing is important.

app/src/main/java/be/ugent/sel/studeez/ui/theme/Color.kt

@@ -2,7 +2,6 @@ package be.ugent.sel.studeez.ui.theme
 
 import androidx.compose.ui.graphics.Color
 
-val Purple200 = Color(0xFFBB86FC)
-val Purple500 = Color(0xFF6200EE)
-val Purple700 = Color(0xFF3700B3)
-val Teal200 = Color(0xFF03DAC5)
+val Blue100   = Color( 30, 100, 200, 255)
+val Blue120   = Color( 27,  90, 180, 255)
+val Yellow100 = Color(255, 210,   0, 255)

app/src/main/java/be/ugent/sel/studeez/ui/theme/Theme.kt

@@ -5,17 +5,20 @@ import androidx.compose.material.MaterialTheme
 import androidx.compose.material.darkColors
 import androidx.compose.material.lightColors
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+
+// Reference colour palette: https://xd.adobe.com/view/3cb1e6ff-eb42-4a74-886e-7739c2ccc5ed-69e2/
 
 private val DarkColorPalette = darkColors(
-    primary = Purple200,
-    primaryVariant = Purple700,
-    secondary = Teal200
+    primary = Blue100,
+    primaryVariant = Blue120,
+    secondary = Yellow100
 )
 
 private val LightColorPalette = lightColors(
-    primary = Purple500,
-    primaryVariant = Purple700,
-    secondary = Teal200
+    primary = Blue100,
+    primaryVariant = Blue120,
+    secondary = Yellow100
 
     /* Other default colors to override
     background = Color.White,